12
NanoTrak Autoalignment Controller
respectively. This setting is provided as a convenient way of smoothing readings
displayed on the GUI only, and does not affect in any way those same readings when
returned by software functions.
To change the setting, click the associated sector.
Relative Signal Power Bar -
The max power located in the alignment. Bar display
showing a convenient visual indication of the feedback signal level. When the input
source is set to TIA (PIN), the bar display indicates the power level with respect to the
currently applied range. E.g. if the TIA range is 1micro, then a bar displaying half
length equates to a power level of 0.5micro. When the input source is set to BNC
(voltage), then bar display indicates the voltage being measured. E.g. for an input
voltage range of 2volts, a bar displaying half length equates to 1volt input signal.
Track
- push button control used to set the NanoTrak to 'Track' mode, using both
horizontal and vertical axes to set a circular scan pattern. When tracking, the
NanoTrak detects any drop in signal strength resulting from misalignment of the input
and output devices, and makes positional adjustments to maintain the maximum. The
LED in the button is lit when selected.
Latch
- push button control used to set the NanoTrak to latch mode, whereby
scanning is disabled and the piezo drives are held at their present position. The LED
in the button is lit when selected.
Horizontal
- push button control used to set the NanoTrak to track using a horizontal
line scan pattern. The LED in the button is lit when selected.
Vertical
- push button control used to set the NanoTrak to track using a vertical line
scan pattern. The LED in the button is lit when selected.
Auto and Manual
- push button control used to toggle between auto and manual
ranging. The LED in the button is lit when selected.
Tracking LED
- lit when the NanoTrak is tracking and measuring feedback signal
levels above a software threshold set in the Tracking settings tab.. This software
threshold is set to reflect the signal levels at or above which the NanoTrak unit will be
tracking at the position of the peak of the feedback signal. This threshold is typically
set to lie above the 'noise floor' of the particular physical arrangement. Note that the
tracking indicator does not apply when the input source is set to BNC (voltage) input.
Active LED
- lit when the unit is operating normally and no error condition exists.
Error LED
- lit when a fault condition occurs, i.e. either a power supply voltage is out
of range, or a channel has closed loop mode selected but the associated piezo is
disconnected.
Circle Position display
- shows the position of the scan circle which in turn,
corresponds to the horizontal and vertical position of the piezo actuators. The width
and height of the display is 20 NanoTrak (NT) units, each division being 1/20th of the
max piezo travel, (e.g. for a 20µm piezo travel, 1 NT unit = 1µm). Right click in the
display to show the Circle Position window - see section Chapter 3.8.
Circle Diameter control
- used to adjust the diameter of the scan circle, when
operating in 'Manual' adjustment mode. The current diameter is displayed in the